| APA | PY. (2012, February 14). In Acronym Geek. Retrieved 06:15, February 14, 2012, from http://www.acronymgeek.com/PY |
| MLA | "PY." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PY>. |
| MHRA | 'PY', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PY> [accessed 14 February 2012] |
| Chicago | "PY", http://www.acronymgeek.com/PY (accessed February 14, 2012). |
| CBE/CSE | PY [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PY. |
| Bluebook | PY, http://www.acronymgeek.com/PY (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PY, http://www.acronymgeek.com/PY (optional description here) (as of Feb. 14, 2012, 06:15). |
| AMA | PY. Acronym Geek. February 14, 2012, 06:15. Available at: http://www.acronymgeek.com/PY. Accessed February 14, 2012, 06:15. |